US4033792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite single crystal article
Assignee: RTX Corp
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Filing: 1976-04-07
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Granted: 1977-07-05
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Expires: 1996-04-07
Abstract
Abstract This invention concerns composite articles, particularly those which contain single crystal components. A method is disclosed for joining single crystals together so that the resultant article is free from high angle grain boundaries and therefore possesses exceptional mechanical properties.
Inventors
- 👤 Anthony F. Giamei
- 👤 Bernard H. Kear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:58
CPC Classifications
C; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52; C30B33/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49245; Y10T29/49316; Y10T29/49336; Y10T29/49337; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A metallic composite blade for use in gas turbine engines, for applications where at least a portion of the blade is exposed to a corrosive environment, including a. a high strength single crystal core element b. at least one oxidation resistant single crystal element bonded to the core element so as to protect the core from the corrosive environment c. a base element bonded to the core element wherein the following relationship is maintained between all bonded adjacent single crystal elements a. the crystal structure types are substantially identical b. the lattice parameters are substantially identical c. the orientations are substantially identical so that there are no mobile high angle grain boundaries between the bonded single crystal elements.
Claim 2
Dependent Claim
118 words
A metallic composite blade for use in gas turbine engines, for applications where at least a portion of the blade is exposed to a corrosive environment, including a. a high strength single crystal core element b. at least one oxidation resistant single crystal element bonded to the core element so as to protect the core from the corrosive environment c. a base element bonded to the core element wherein the following relationship is maintained between all bonded adjacent single crystal elements a. the crystal structure types are substantially identical b. the lattice parameters are substantially identical c. the orientations are substantially identical so that there are no mobile high angle grain boundaries between the bonded single crystal elements.
Claim 3
Dependent Claim
14 words
A blade as in claim 1 wherein the base element is a single crystal.
Claim 4
Dependent Claim
99 words
A metallic composite blade for use in gas turbine engines including a. a core element of eutectic composition having an oriented microstructure b. a base element bonded to the core element c. a protective single crystal sheath, formed from a plurality of single crystals, bonded to the core element with the single crystals being bonded to each other and having the following relationship a. the crystal structure types are substantially identical b. the lattice parameters are substantially identical c. the crystal orientations are substantially identical whereby there are no mobile high angle grain boundaries between the bonded single crystals.
Claim 5
Dependent Claim
99 words
A metallic composite blade for use in gas turbine engines including a. a core element of eutectic composition having an oriented microstructure b. a base element bonded to the core element c. a protective single crystal sheath, formed from a plurality of single crystals, bonded to the core element with the single crystals being bonded to each other and having the following relationship a. the crystal structure types are substantially identical b. the lattice parameters are substantially identical c. the crystal orientations are substantially identical whereby there are no mobile high angle grain boundaries between the bonded single crystals.
References Cited (Backward Citations)
US3494709A
Cited
US3826700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |